395 lines
10 KiB
C
395 lines
10 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: sockets.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Input/Output C implemented predicates *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* This file includes the definition of a socket related IO.
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*
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*/
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#include "sysbits.h"
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#if !MAY_READ
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static int MemGetc(int);
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/* read from memory */
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static int MemGetc(int sno) {
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register StreamDesc *s = &GLOBAL_Stream[sno];
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Int ch;
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int spos;
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spos = s->u.mem_string.pos;
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if (spos == s->u.mem_string.max_size) {
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return -1;
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} else {
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ch = s->u.mem_string.buf[spos];
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s->u.mem_string.pos = ++spos;
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}
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return ch;
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}
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#endif
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#if !MAY_WRITE
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static int MemPutc(int, int);
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/* static */
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static int MemPutc(int sno, int ch) {
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StreamDesc *s = &GLOBAL_Stream[sno];
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#if MAC || _MSC_VER
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if (ch == 10) {
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ch = '\n';
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}
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#endif
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s->u.mem_string.buf[s->u.mem_string.pos++] = ch;
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if (s->u.mem_string.pos >= s->u.mem_string.max_size - 8) {
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int old_src = s->u.mem_string.src, new_src;
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/* oops, we have reached an overflow */
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Int new_max_size = s->u.mem_string.max_size + Yap_page_size;
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char *newbuf;
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if (old_src == MEM_BUF_CODE &&
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(newbuf = Yap_AllocAtomSpace(new_max_size * sizeof(char))) != NULL) {
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new_src = MEM_BUF_CODE;
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#if HAVE_MEMMOVE
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memmove((void *)newbuf, (void *)s->u.mem_string.buf,
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(size_t)((s->u.mem_string.pos) * sizeof(char)));
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#else
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{
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Int n = s->u.mem_string.pos;
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char *to = newbuf;
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char *from = s->u.mem_string.buf;
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while (n-- >= 0) {
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*to++ = *from++;
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}
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}
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#endif
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Yap_FreeAtomSpace(s->u.mem_string.buf);
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#if !HAVE_SYSTEM_MALLOC
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} else if ((newbuf = (ADDR)realloc(s->u.mem_string.buf,
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new_max_size * sizeof(char))) != NULL) {
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new_src = MEM_BUF_MALLOC;
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#endif
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} else {
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if (GLOBAL_Stream[sno].u.mem_string.error_handler) {
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CACHE_REGS
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LOCAL_Error_Size = new_max_size * sizeof(char);
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save_machine_regs();
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longjmp(*(jmp_buf *)GLOBAL_Stream[sno].u.mem_string.error_handler, 1);
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} else {
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Yap_Error(RESOURCE_ERROR_HEAP, TermNil,
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"YAP could not grow heap for writing to string");
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}
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return -1;
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}
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if (old_src == MEM_BUF_CODE) {
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}
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s->u.mem_string.buf = newbuf;
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s->u.mem_string.max_size = new_max_size;
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s->u.mem_string.src = new_src;
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}
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count_output_char(ch, s);
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return ((int)ch);
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}
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#endif
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int Yap_open_buf_read_stream(const char *nbuf, size_t nchars, encoding_t *encp,
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memBufSource src) {
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CACHE_REGS
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int sno;
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StreamDesc *st;
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FILE *f;
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encoding_t encoding;
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stream_flags_t flags;
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sno = GetFreeStreamD();
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if (sno < 0)
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return (PlIOError(RESOURCE_ERROR_MAX_STREAMS, TermNil,
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"new stream not available for open_mem_read_stream/1"));
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st = GLOBAL_Stream + sno;
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if (encp)
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encoding = *encp;
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else
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encoding = LOCAL_encoding;
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#if MAY_READ
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// like any file stream.
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f = fmemopen((void *)nbuf, nchars, "r");
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flags = Input_Stream_f | InMemory_Stream_f | Seekable_Stream_f;
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#else
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f = NULL;
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flags = Input_Stream_f | InMemory_Stream_f;
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#endif
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Yap_initStream(sno, f, NULL, TermNil, encoding, flags, AtomRead);
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// like any file stream.
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#if !MAY_READ
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/* currently these streams are not seekable */
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st->status = Input_Stream_f | InMemory_Stream_f;
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st->u.mem_string.pos = 0;
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st->u.mem_string.buf = (char *)nbuf;
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st->u.mem_string.max_size = nchars;
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st->u.mem_string.error_handler = NULL;
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st->u.mem_string.src = src;
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#endif
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Yap_DefaultStreamOps(st);
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UNLOCK(st->streamlock);
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return sno;
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}
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static Int
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open_mem_read_stream(USES_REGS1) /* $open_mem_read_stream(+List,-Stream) */
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{
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Term t, ti;
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int sno;
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Int sl = 0, nchars = 0;
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char *nbuf;
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ti = Deref(ARG1);
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while (ti != TermNil) {
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if (IsVarTerm(ti)) {
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Yap_Error(INSTANTIATION_ERROR, ti, "open_mem_read_stream");
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return (FALSE);
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} else if (!IsPairTerm(ti)) {
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Yap_Error(TYPE_ERROR_LIST, ti, "open_mem_read_stream");
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return (FALSE);
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} else {
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sl++;
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ti = TailOfTerm(ti);
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}
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}
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while ((nbuf = (char *)Yap_AllocAtomSpace((sl + 1) * sizeof(char))) == NULL) {
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if (!Yap_growheap(FALSE, (sl + 1) * sizeof(char), NULL)) {
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Yap_Error(RESOURCE_ERROR_HEAP, TermNil, LOCAL_ErrorMessage);
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return (FALSE);
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}
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}
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ti = Deref(ARG1);
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while (ti != TermNil) {
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Term ts = HeadOfTerm(ti);
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if (IsVarTerm(ts)) {
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Yap_Error(INSTANTIATION_ERROR, ARG1, "open_mem_read_stream");
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return (FALSE);
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} else if (!IsIntTerm(ts)) {
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Yap_Error(TYPE_ERROR_INTEGER, ARG1, "open_mem_read_stream");
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return (FALSE);
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}
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nbuf[nchars++] = IntOfTerm(ts);
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ti = TailOfTerm(ti);
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}
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nbuf[nchars] = '\0';
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sno = Yap_open_buf_read_stream(nbuf, nchars, &LOCAL_encoding, MEM_BUF_CODE);
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t = Yap_MkStream(sno);
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return (Yap_unify(ARG2, t));
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}
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int Yap_open_buf_write_stream(char *buf, size_t nchars, encoding_t *encp,
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memBufSource sr) {
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CACHE_REGS
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int sno;
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StreamDesc *st;
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sno = GetFreeStreamD();
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if (sno < 0)
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return -1;
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st = GLOBAL_Stream + sno;
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st->status = Output_Stream_f | InMemory_Stream_f;
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if (!buf) {
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if (!nchars) {
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nchars = Yap_page_size;
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}
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buf = malloc(nchars);
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st->status |= FreeOnClose_Stream_f;
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}
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st->nsize = nchars;
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st->linepos = 0;
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st->charcount = 0;
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st->linecount = 1;
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if (encp)
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st->encoding = *encp;
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else
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st->encoding = LOCAL_encoding;
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Yap_DefaultStreamOps(st);
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#if MAY_WRITE
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#if HAVE_FMEMOPEN
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st->file = fmemopen((void *)buf, nchars, "w");
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#else
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st->file = open_memstream(buf, &st->nsize);
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st->status |= Seekable_Stream_f;
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#endif
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st->nsize = nchars;
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st->nbuf = buf;
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if (!st->nbuf) {
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return -1;
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}
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st->u.mem_string.pos = 0;
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st->u.mem_string.buf = st->nbuf;
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st->u.mem_string.max_size = nchars;
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#endif
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UNLOCK(st->streamlock);
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return sno;
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}
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int Yap_OpenBufWriteStream(USES_REGS1) {
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char *nbuf;
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size_t sz = Yap_page_size;
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while ((nbuf = (char *)Yap_AllocAtomSpace(Yap_page_size * sizeof(char))) ==
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NULL) {
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if (!Yap_growheap(FALSE, Yap_page_size * sizeof(char), NULL)) {
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Yap_Error(RESOURCE_ERROR_HEAP, TermNil, LOCAL_ErrorMessage);
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return -1;
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}
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}
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return Yap_open_buf_write_stream(
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nbuf, sz, &GLOBAL_Stream[LOCAL_c_output_stream].encoding, 0);
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}
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static Int
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open_mem_write_stream(USES_REGS1) /* $open_mem_write_stream(-Stream) */
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{
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Term t;
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int sno;
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sno = Yap_OpenBufWriteStream(PASS_REGS1);
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if (sno == -1)
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return (PlIOError(SYSTEM_ERROR_INTERNAL, TermNil,
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"new stream not available for open_mem_read_stream/1"));
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t = Yap_MkStream(sno);
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return (Yap_unify(ARG1, t));
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}
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/**
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* Yap_PeekMemwriteStream() shows the current buffer for a memory stream.
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*
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* @param sno, the in-memory stream
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*
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* @return temporary buffer, discarded by close and may be moved away
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* by other writes..
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*/
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char *Yap_MemExportStreamPtr(int sno) {
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#if MAY_WRITE
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char *s;
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if (fflush(GLOBAL_Stream[sno].file) == 0) {
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s = GLOBAL_Stream[sno].nbuf;
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return s;
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}
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return NULL;
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#else
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return GLOBAL_Stream[sno].u.mem_string.buf;
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#endif
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}
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static Int peek_mem_write_stream(
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USES_REGS1) { /* '$peek_mem_write_stream'(+GLOBAL_Stream,?S0,?S) */
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Int sno =
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Yap_CheckStream(ARG1, (Output_Stream_f | InMemory_Stream_f), "close/2");
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Int i;
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Term tf = ARG2;
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CELL *HI;
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const char *ptr;
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if (sno < 0)
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return (FALSE);
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restart:
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HI = HR;
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#if MAY_WRITE
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if (fflush(GLOBAL_Stream[sno].file) == 0) {
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ptr = GLOBAL_Stream[sno].nbuf;
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i = GLOBAL_Stream[sno].nsize;
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}
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#else
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ptr = GLOBAL_Stream[sno].u.mem_string.buf;
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i = GLOBAL_Stream[sno].u.mem_string.pos;
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#endif
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while (i > 0) {
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--i;
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tf = MkPairTerm(MkIntTerm(ptr[i]), tf);
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if (HR + 1024 >= ASP) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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HR = HI;
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if (!Yap_gcl((ASP - HI) * sizeof(CELL), 3, ENV, Yap_gcP())) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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Yap_Error(RESOURCE_ERROR_STACK, TermNil, LOCAL_ErrorMessage);
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return (FALSE);
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}
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i = GLOBAL_Stream[sno].u.mem_string.pos;
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tf = ARG2;
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LOCK(GLOBAL_Stream[sno].streamlock);
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goto restart;
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}
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}
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify(ARG3, tf));
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}
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void Yap_MemOps(StreamDesc *st) {
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#if MAY_WRITE
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st->stream_putc = FilePutc;
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#else
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st->stream_putc = MemPutc;
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#endif
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#if MAY_READ
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st->stream_getc = PlGetc;
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#else
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st->stream_getc = MemGetc;
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#endif
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}
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bool Yap_CloseMemoryStream(int sno) {
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if (!(GLOBAL_Stream[sno].status & Output_Stream_f)) {
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#if MAY_WRITE
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fclose(GLOBAL_Stream[sno].file);
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if (GLOBAL_Stream[sno].status & FreeOnClose_Stream_f)
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free(GLOBAL_Stream[sno].nbuf);
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#else
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if (GLOBAL_Stream[sno].u.mem_string.src == MEM_BUF_CODE)
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Yap_FreeAtomSpace(GLOBAL_Stream[sno].u.mem_string.buf);
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else if (GLOBAL_Stream[sno].u.mem_string.src == MEM_BUF_MALLOC) {
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free(GLOBAL_Stream[sno].u.mem_string.buf);
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}
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#endif
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} else {
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#if MAY_READ
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fclose(GLOBAL_Stream[sno].file);
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Yap_FreeAtomSpace(GLOBAL_Stream[sno].nbuf);
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#else
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if (GLOBAL_Stream[sno].u.mem_string.src == MEM_BUF_CODE)
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Yap_FreeAtomSpace(GLOBAL_Stream[sno].u.mem_string.buf);
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else if (GLOBAL_Stream[sno].u.mem_string.src == MEM_BUF_MALLOC) {
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free(GLOBAL_Stream[sno].u.mem_string.buf);
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}
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#endif
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}
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return true;
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}
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void Yap_InitMems(void) {
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CACHE_REGS
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Term cm = CurrentModule;
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CurrentModule = CHARSIO_MODULE;
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Yap_InitCPred("open_mem_read_stream", 2, open_mem_read_stream, SyncPredFlag);
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Yap_InitCPred("open_mem_write_stream", 1, open_mem_write_stream,
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SyncPredFlag);
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Yap_InitCPred("peek_mem_write_stream", 3, peek_mem_write_stream,
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SyncPredFlag);
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CurrentModule = cm;
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}
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